1、ITU-T RECNN*E-743 75 H 9862571 Ob00683 804 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E.743 (04/95) TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING TRAFFIC MEASUREMENTS FOR SS No. 7 DIMENSIONING AND PLANNING I
2、TU-T Recommendation E.743 (Previously “CCIlT Recommendation”) ITU-T RECMNuE.743 95 m 4862591 0600684 740 FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating a
3、nd tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn
4、, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation E.743 was prepared by ITU-T Study Group 2 (1993-1996) and was approved under the WT
5、SC Resolution No. 1 procedure on the 21st of April 1995. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1995 All rights reserved. No part of this publication may be repr
6、oduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. ITU-T RECMNxE.743 95 4862593 0600685 687 CONTENTS Page 1 Introduction 1 2 Measurements for dimensioning SS No. 7 link sets . 1 3 Measurements fo
7、r dimensioning nodes 1 4 Measurements for forecasting 2 4.1 Call attempts . 2 4.2 Message distributions . 3 Recommendation E.743 (04f95) i ITU-T RECMN*E-743 95 48b2591 Ob00686 513 = SUMMARY Recommendation ES05 lists a large number of measurements relating to SS No. 7 operation. These measurements ar
8、e intended to satisfy a number of different needs. This Recommendation identifies the sub-set of the measurements in Recommendation ES05 which are useful for SS No. 7 dimensioning and planning activities. ii Recommendation E.743 (04/95) ITU-T RECMN*E-743 95 I 4862593 0600687 45T I Recommendation E.7
9、43 TRAFFIC MEASUREMENTS FOR SS No. 7 DIMENSIONING AND PLANNING (Geneva, 1995) 1 Introduction Recommendation E.505 lists a large number of measurements relating to SS No. 7 operation. These measurements are intended to satisfy a number of different needs. This Recommendation identifies the sub-set of
10、 the measurements in Recommendation E.505 which are useful for SS No. 7 dimensioning and planning activities. In the following clauses, the measurement type numbers are taken from Recommendation E.505. 2 Measurements for dimensioning SS No. 7 link sets Type 1 - Signalling link pe$ormance Object: Mes
11、sage Transfer Part (MTP) signalling links (selectable) Entities: g = number of Signal Information Field (SIF) octets and Service Information Octets (SIO) transmitted; h = number of octets retransmitted; i) = number of Message Signal Unit (MSU) transmitted; j = number of SIF and SI0 octets received;
12、k = number of MSU received. “The transmitted load is calculatedfrom entity g + six times i. The received load is calculated from entity j + six times k. These loads should be monitored and the mmimum capacity compared to the rho-max value used in the Recommendation E.733 dimensioning procedure. Enti
13、ty h is also of interest as an indicator of possible excessive transmission error.” 3 Measurements for dimensioning nodes Type 14 - Signalling Connection Control Part (SCCP) utilization Object: SCCP (overall) Entities: a) b) c) d) e) f) g) number of Unit Data Service (UDTS) messages sent; number of
14、UDTS messages received; number of messages handled (from local or remote sub-systems); number of messages intended for local sub-systems; number of messages requiring global title translation (Note 1); number of messages sent (for connectionless only) (by class O, I); number of messages received (fo
15、r connection only) (by class O, 1); Recommendation E.743 (04/95) 1 ITU-T RECMNME.743 95 M 48b259L 0600688 39b h) number of messages sent to a back up sub-system (Note 2). NOTES 1 2 This measurement is only required at SCCP nodes with global title translation capabilities. This measurement is system
16、dependent. Type 20 - Transaction Capability Application Part (TCAP) component utilization Object: TCAP component type (selectable) Entities: a) b) c) number of components sent by the node; number of components received by the node; number of simultaneous TCAP transactions (for further study). Type 2
17、1 - TCAP message utilization Object: TCAP message types (selectable) Entities: a) b) number of TCAP messages sent by the node; number of TCAP messages received by the node. Node dimensioning methods are for further study but it can be anticipated that the loads represented by these measurements will
18、 be useful. 4 Measurements for forecasting 4.1 Call attempts Type 17 - 1SDN User Part (ISUP) node performance NOTE - This measurement type does not relate to signalling performance; rather, it uses signalling network user part information to indicate the performance of the network node supported by
19、the signalling network. This measurement type relates to the total incoming traffic delivered to the node by ISUP. The unsuccessful call attempt categories are based on the ISUP cause indicator parameter, and relate to the unsuccessful call attempts that fail in the node where the measurements are t
20、aken. Object: ISUP (overall) Entities: - number of total incoming call attempts. Type 18 - 1SUP network performance NOTE - This measurement type does not relate to signalling network performance; rather, it uses signalling network user part information to indicate the performance of the associated s
21、witched network onward from the node where the measurements are taken. The unsuccessful call attempt categories are based on the ISUP cause parameter received, and relate to the unsuccessful call attempts that fail in the distant node. Object: Originating Point Code (OPC) in the Received Message (se
22、lectable) Entities: - number of total outgoing call attempts. This call attempt data can be projected together with assumed messages per-call attempt to give future signalling needs. ?The call attempt data can be projected from circuit forecasts by using these measurements with corresponding circuit
23、 counts to determine call attempt/circuit/unit time?. 2 Recommendation E.743 (04/95) ITU-T RECMN*E.743 95 4862593 0600689 222 4.2 Message distributions Type 6 - Received signalling trafic distribution Object: OPC (selectable) Entities: - number of SIF and SI0 octets received. Type 7 - Transmitted si
24、gnalling traffic distribution Object: Destination Point Code PC) (selectable) Entities: - number of SIF and SI0 octets transmitted. Type 8 - MTP signalling message distribution Object: SI0 (selectable) Entities: - number of SIF and SI0 octets handled. Type 9 - MTP received signalling message distrib
25、ution Object: OPC/SIO combination (selectable) Entities: - number of SIF and SI0 octets received. Type IO - MTP transmitted signalling message distribution Object: DPC/SIO combination (selectable) Entities: - number of SIF and SI0 octets transmitted. Type I I - Detailed MTP signalling message distribution Object: OPCDPC/SIO combination (selectable) Entities: - number of SIF and SI0 octets handled. Recommendation E.743 (04/95) 3
